Control RGB LEDS (common cathode) with a Mosfet or a transistor

JohnRob:
Folks differ on whether the 1k in the N-Mosfet Gate is needed or not.

They also differ on whether the pull down should be on the controller side or the mosfet side of that 1k, if fitted. Technically, the way you have it the 1k and 10k make a divider, which conditions the voltage to the gate. In practice it might make little difference since the divider's very lopsided and gives over 4.5V from 5V, but hey, it's just as easy to put it on the other side where it's technically correct.